At this very momment, I have one monitor (19inch CRT) and one HDTV (27inch LCD) hooked up to my PC. The HDTV is my primary, and the CRT is my secondary. Once I get a PCI vid card on this box too, I'll hook up the second CRT for a total of 3 monitors on this desk. Though I may get carried away and put 2 PCI cards on this box and go with 4 moniters (I can sacrifice the monitor on my server.)